Subtract 18/21 from 3/2
1st number: 1 1/2, 2nd number: 18/21
3/2 - 18/21 is 9/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 2 × 21 = 42,
3/2 = 3 × 21/2 × 21 = 63/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
18/21 = 18 × 2/21 × 2 = 36/42 - Subtract the two like fractions:
63/42 - 36/42 = 63 - 36/42 = 27/42 - After reducing the fraction, the answer is 9/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/2-18/21 3/2-36/21 3/4-18/21 3/2-18/42 9/2-18/21 3/2-54/21 3/6-18/21 3/2-18/63 15/2-18/21 3/2-90/21 3/10-18/21 21/2-18/21 3/14-18/21